A casting apparatus for foamed concrete

Abstract

The application discloses a pouring equipment for foamed concrete and relates to the technical field of concrete pouring, which comprises a supporting table, the bottoms of transition boxes are uniformly provided with a plurality of linearly distributed discharge pipes, a driving assembly is installed on the supporting table for driving the rotation of a spiral shaft, a fixed gear is fixedly sleeved on a fixed column, an extension sleeve plate is slidably sleeved on a rotating plate, an extension assembly is installed on the rotating plate for driving the extension sleeve plate to slide relative to the rotating plate, and a leveling assembly is installed on a rotating sleeve. The spiral shaft is arranged to rotate to realize the conveying of the foamed concrete in the conveying cylinder body, the incomplete bevel gears in the driving assembly are alternately meshed with the two bevel gears, the spiral shaft is alternately rotated clockwise and counterclockwise, the concrete in the discharge pipes can be uniformly discharged through the plurality of discharge pipes to the foamed concrete, and the on-site pouring quality of the foamed concrete is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete pouring, in particular to a pouring equipment for foamed concrete. BACKGROUND

[0002] Foamed concrete, also known as foamed concrete, is a new type of material containing a large number of closed pores formed by fully foaming the foaming agent by the foaming system of the foaming machine, uniformly mixing the foam with the cement slurry, and then pumping it on site by the pumping system of the foaming machine.

[0003] During the on-site pouring of foamed concrete, the delivery pipeline of the pouring equipment extends to the pouring site for pouring foamed concrete. During the pouring process, the foamed concrete cannot be evenly distributed, and the flatness of the foamed concrete at the pouring site after pouring is low, which is prone to unevenness and pothole defects, resulting in difficulty in meeting the construction requirements of the on-site pouring of foamed concrete, and subsequent rework maintenance is required. In view of the above technical defects of the prior art, the present application provides a pouring equipment for foamed concrete to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a pouring equipment for foamed concrete to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A pouring equipment for foamed concrete, comprising a support table and a translation frame, a mounting frame is fixed on the support table, a delivery cylinder is fixed on the support table, a spiral shaft is rotatably installed in the delivery cylinder, a transition box is fixed on the delivery cylinder and communicates with the delivery cylinder, a delivery pipe is installed in communication on the transition box, a plurality of linearly distributed discharge pipes are uniformly installed at the bottom of the delivery cylinder, a driving assembly for driving the spiral shaft to rotate is installed on the support table, a protective cover is installed at the bottom of the support table, two fixed columns fixed with the support table are installed in the protective cover, a fixed gear is sleeved and fixed on each fixed column, a rotating plate is rotatably installed on each fixed column, a traction assembly for driving the rotating plate to rotate is installed in the protective cover, an extension sleeve plate is sleeved and slidably installed on the rotating plate, an extension assembly for driving the extension sleeve plate to slide relative to the rotating plate is installed on the rotating plate, a pair of rotating sleeves are rotatably installed at the bottom of the extension sleeve plate, the two rotating sleeves are drivingly connected through a belt pulley mechanism II, and a leveling assembly is installed on the rotating sleeve.

[0007] As a further improved scheme of the present application, the driving assembly comprises a gear box fixed on the support table, two bevel gears coaxially fixed with the spiral shaft are rotatably arranged in the gear box, an incomplete bevel gear is rotatably arranged in the gear box and alternatively meshes with the two bevel gears, a double-shaft motor is fixed on the support table, and one output shaft of the double-shaft motor is in transmission connection with the incomplete bevel gear through a belt pulley mechanism I.

[0008] As a further improved scheme of the present application, the traction assembly comprises a pin column fixed on the translation frame, an extension plate is fixed on the end of the rotating plate away from the extension sleeve plate, a strip-shaped hole is formed in the extension plate, and the pin column is in sliding fit with the strip-shaped hole.

[0009] As a further improved scheme of the present application, the traction assembly further comprises a rotating disc rotatably arranged at the bottom of the support table, the other output shaft of the double-shaft motor is coaxially fixed with the rotating disc, a sliding column is eccentrically hinged on the rotating disc, a back-shaped frame is fixed on the translation frame, the sliding column is in sliding fit with the back-shaped frame, a horizontal rod is fixed at the bottom of the support table, and the translation frame is slidingly sleeved on the horizontal rod.

[0010] As a further improved scheme of the present application, the extension assembly comprises an intermediate gear and a transmission gear rotatably arranged on the rotating plate, the fixed gear and the transmission gear are in meshing connection with the intermediate gear, a rack parallel to the rotating plate is fixed on the extension sleeve plate, and the rack is in meshing connection with the transmission gear.

[0011] As a further improved scheme of the present application, the extension assembly further comprises a fixed plate fixed on the extension sleeve plate, a vertical plate is fixed on the rotating plate, a sliding rod slidingly penetrating through the vertical plate is fixed on the fixed plate, spring rings sleeved with the fixed plate and the vertical plate at two ends are sleeved on the sliding rod, and an arc-shaped guide rod is fixed at the bottom of the support table, and the vertical plate is slidingly sleeved on the arc-shaped guide rod.

[0012] As a further improved scheme of the present application, the flattening assembly comprises a sliding column vertically slidingly arranged on the rotating sleeve, a clamping strip slidingly embedded in the inner wall of the rotating sleeve is fixed on the side wall of the sliding column, a flattening disc horizontally arranged is fixed at the bottom of the sliding column, a driving motor for driving the rotating sleeve to rotate is fixed on the extension sleeve plate, and an adjusting assembly for driving the sliding column to vertically move is arranged on the support table.

[0013] As a further improved scheme of the present application, the adjusting assembly comprises a screw rod rotatably arranged on the support table, a threaded sleeve is threadedly sleeved on the screw rod, a limiting rod is fixed at the bottom of the support table, a guide frame slidingly sleeved on the limiting rod is fixed on the threaded sleeve, a poking frame is fixed at the bottom of the threaded sleeve, a Y-shaped slot is formed in the poking frame, a connecting frame is clamped in the Y-shaped slot, and the sliding column is rotatably arranged on the connecting frame.

[0014] As an improvement of the present invention: the adjusting assembly further includes a sleeve block fixed to the side wall of the rotating sleeve, a limiting block is slidably installed inside the sleeve block, a connecting spring is fixed between the limiting block and the sleeve block, a plurality of V-shaped slots are vertically opened on the side wall of the sliding column to engage with the limiting block, the V-shaped slots are linearly distributed at equal intervals along the axial direction of the sliding column, and an axial spring is fixed between the sliding column and the rotating sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention uses a rotating spiral shaft to transport foamed concrete inside the conveying cylinder. The spiral shaft rotates clockwise and counterclockwise alternately by the intermeshing of two bevel gears in the drive assembly, ensuring that the concrete inside the discharge pipe can be evenly discharged through multiple discharge pipes, which greatly improves the on-site pouring quality of foamed concrete.

[0017] This invention uses a rotating leveling plate to level the foamed concrete at the pouring site. Driven by the traction component, the rotating plate can cause the extension sleeve and leveling component to swing around the center of the fixed column, effectively expanding the leveling range of the foamed concrete at the pouring site. Under the action of the extension component, the extension sleeve can slide back and forth relative to the rotating plate, significantly improving the on-site pouring effect of foamed concrete. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 A structural diagram from a certain perspective;

[0020] Figure 3 For the present invention Figure 2 Enlarged diagram of section A in the middle;

[0021] Figure 4 This is a partial structural diagram of the present invention;

[0022] Figure 5 For the present invention Figure 4 A structural diagram from a certain perspective;

[0023] Figure 6 This is a schematic diagram showing the connection of components such as the rotating sleeve, sliding column, sleeve block, and limiting block in this invention;

[0024] Figure 7 This is a schematic diagram showing the connection of components such as the screw, threaded sleeve, and lever in this invention;

[0025] Figure 8 Figure is a schematic diagram of the connection of the screw shaft, drive assembly, rotating disc and translation frame in the application.

[0026] Figure: 1-supporting table, 2-mounting frame, 3-conveying pipe, 4-transition box, 5-conveying cylinder, 6-gear box, 7-protective cover, 8-discharge pipe, 9-double-shaft motor, 10-belt pulley mechanism I, 11-rotating disc, 12-extended sleeve plate, 13-flattening disc, 14-driving motor, 15-rotary sleeve, 16-pushing frame, 17-back-shaped frame, 18-sliding column, 19-translation frame, 20-fixed gear, 21-intermediate gear, 22-transmission gear, 23-fixed column, 24-extended plate, 25-vertical plate, 26-sliding rod, 27-fixed plate, 28-spring ring, 29-belt pulley mechanism II, 30-sleeve block, 31-connection frame, 32-threaded sleeve, 33-strip-shaped hole, 34-connection spring, 35-limiting block, 36-axial spring, 37-clamping strip, 38-V-shaped clamping groove, 39-screw rod, 40-Y-shaped groove, 41-twisting wheel, 42-limiting rod, 43-screw shaft, 44-incomplete bevel gear, 45-pin column, 46-bevel gear, 47-guiding frame, 48-horizontal rod, 49-rotating plate, 50-arc-shaped guide rod, 51-rack, 52-sliding column. DETAILED DESCRIPTION

[0027] The technical solutions of the application will be further described in detail below in combination with specific embodiments:

[0028] First embodiment:

[0029] Please refer to Figures 1-8 A pouring device for foamed concrete, comprising a supporting table 1 and a translation frame 19, the supporting table 1 is fixed with a mounting frame 2, the supporting table 1 is fixed with a conveying cylinder 5, the conveying cylinder 5 is rotatably installed with a screw shaft 43, the conveying cylinder 5 is fixed with a transition box 4 in communication therewith, the transition box 4 is installed with a conveying pipe 3 in communication, the bottom of the conveying cylinder 5 is uniformly installed with a plurality of linearly distributed discharge pipes 8, the supporting table 1 is installed with a drive assembly for driving the screw shaft 43 to rotate, the bottom of the supporting table 1 is installed with a protective cover 7, the protective cover 7 is installed with two fixed columns 23 fixed with the supporting table 1, the fixed columns 23 are fixedly sleeved with fixed gears 20, each fixed column 23 is rotatably installed with a rotating plate 49, the protective cover 7 is installed with a traction assembly for driving the rotating plate 49 to rotate, the rotating plate 49 is slidably sleeved with an extended sleeve plate 12, the rotating plate 49 is installed with an extension assembly for driving the extended sleeve plate 12 to slide relative to the rotating plate 49, the bottom of the extended sleeve plate 12 is rotatably installed with a pair of rotary sleeves 15, the two rotary sleeves 15 are drivingly connected through a belt pulley mechanism II 29, the rotary sleeves 15 are installed with a flattening assembly.

[0030] When the foamed concrete is cast on site, the mounting frame 2 is fixed to the external moving device, the moving device drives the support table 1 to move through the mounting frame 2, so that the casting area of the foamed concrete is adjusted, and the entire casting site is cast.

[0031] The external pumping system injects the foamed concrete into the transition box 4 through the conveying pipe 3, and then the foamed concrete enters the middle part of the conveying cylinder 5 from the transition box 4. The driving assembly drives the spiral shaft 43 to rotate and convey the foamed concrete in the conveying cylinder 5. The foamed concrete is discharged through the plurality of discharge pipes 8 to the casting site area for casting.

[0032] Specifically, the driving assembly includes a gear box 6 fixed on the support table 1, two bevel gears 46 coaxially fixed with the spiral shaft 43 are rotatably installed in the gear box 6, an incomplete bevel gear 44 is rotatably installed in the gear box 6, the incomplete bevel gear 44 is alternately engaged with the two bevel gears 46, and a double-shaft motor 9 is fixed on the support table 1. One output shaft of the double-shaft motor 9 is in transmission connection with the incomplete bevel gear 44 through a belt pulley mechanism I10.

[0033] The double-shaft motor 9 drives the incomplete bevel gear 44 to rotate through the belt pulley mechanism I10. The incomplete bevel gear 44 is alternately engaged with the two bevel gears 46. Under the transmission action of the bevel gears 46, the spiral shaft 43 can alternately rotate clockwise and counterclockwise. That is, the foamed concrete entering the middle part of the conveying cylinder 5 from the transition box 4 can reciprocate relative to the axial direction of the conveying cylinder 5. This ensures that the foamed concrete can be uniformly dispersed and discharged from the plurality of discharge pipes 8 to the casting site, the foamed concrete is more uniformly cast, and the casting quality of the foamed concrete is ensured.

[0034] Second embodiment:

[0035] Please refer to Figures 1-8 On the basis of the first embodiment, in addition, the traction assembly of the device includes a pin column 45 fixed on the translation frame 19, an extension plate 24 is fixed to one end of the rotating plate 49 away from the extension sleeve plate 12, a strip-shaped hole 33 is formed in the extension plate 24, and the pin column 45 is slidably fitted with the strip-shaped hole 33. The traction assembly further includes a turntable 11 rotatably installed at the bottom of the support table 1, the other output shaft of the double-shaft motor 9 is coaxially fixed with the turntable 11, the turntable 11 is eccentrically hinged with a sliding column 18, a back-shaped frame 17 is fixed on the translation frame 19, the sliding column 18 is slidably fitted with the back-shaped frame 17, a horizontal rod 48 is fixed at the bottom of the support table 1, and the translation frame 19 is slidably sleeved on the horizontal rod 48.

[0036] With the above arrangement, while the double-shaft motor 9 drives the belt pulley mechanism I10, the double-shaft motor 9 drives the rotating disc 11 to rotate, the rotating disc 11 drives the slide post 18 installed thereon to slide relative to the meandering frame 17, so that the meandering frame 17 can drive the translation frame 19 to reciprocatingly slide relative to the horizontal rod 48, at this time, the pin post 45 on the translation frame 19 drives the extension plate 24 to rotate through the strip-shaped hole 33, the extension plate 24 drives the rotating plate 49 to alternately rotate clockwise and counterclockwise, and then the extension sleeve plate 12 drives the flattening assembly installed thereon to move, so as to ensure that the flattening assembly fully flattens the foamed concrete at the pouring site, and effectively improves the pouring effect of the foamed concrete.

[0037] In addition, the extension assembly of the device comprises an intermediate gear 21 rotatably installed on the rotating plate 49 and a transmission gear 22, the fixed gear 20 and the transmission gear 22 are in meshing connection with the intermediate gear 21, the extension sleeve plate 12 is fixed with a rack 51 parallel to the rotating plate 49, and the rack 51 is in meshing connection with the transmission gear 22. The extension assembly further comprises a fixed plate 27 fixed on the extension sleeve plate 12, the rotating plate 49 is fixed with a vertical plate 25, the fixed plate 27 is fixed with a slide rod 26 slidingly penetrating through the vertical plate 25, the slide rod 26 is sleeved with spring rings 28 fixed at two ends of the fixed plate 27 and the vertical plate 25 respectively, and the bottom of the support table 1 is fixed with an arc-shaped guide rod 50, and the vertical plate 25 is slidingly sleeved on the arc-shaped guide rod 50.

[0038] During the process of the rotating plate 49 alternately rotating clockwise and counterclockwise, the rotating plate 49 drives the intermediate gear 21 thereon to rotate around the fixed gear 20, at this time, the intermediate gear 21 rotates and drives the transmission gear 22 to rotate, the transmission gear 22 drives the rack 51 to drive the extension sleeve plate 12 to linearly reciprocatingly slide relative to the rotating plate 49 during the process of alternately rotating clockwise and counterclockwise, and in combination with the clockwise and counterclockwise alternate rotation of the extension sleeve plate 12, the flattening range of the flattening assembly to the foamed concrete is significantly improved, and as the support table 1 moves, the foamed concrete is fully flattened by the flattening assembly after being poured to the construction site, which greatly improves the pouring effect of the foamed concrete.

[0039] The flattening assembly comprises a slide post 52 vertically and slidingly installed on the rotating sleeve 15, the side wall of the slide post 52 is fixed with a clamping strip 37 slidingly embedded in the inner wall of the rotating sleeve 15, the bottom of the slide post 52 is fixed with a horizontally arranged flattening disc 13, the extension sleeve plate 12 is fixed with a driving motor 14 for driving the rotating sleeve 15 to rotate, and the support table 1 is installed with an adjusting assembly for driving the slide post 52 to vertically move. The driving motor 14 is arranged to drive the rotating sleeve 15 to rotate, the rotating sleeve 15 drives the slide post 52 and the flattening disc 13 to rotate through the clamping strip 37, and then the flattening disc 13 rotates to flatten the foamed concrete.

[0040] Further, the adjusting assembly comprises a screw rod 39 rotatably installed on the support table 1, a threaded sleeve 32 threadedly sleeved on the screw rod 39, a limiting rod 42 fixed at the bottom of the support table 1, a guide frame 47 slidably sleeved on the limiting rod 42 and fixed on the threaded sleeve 32, a pushing frame 16 fixed at the bottom of the threaded sleeve 32, a Y-shaped slot 40 formed in the pushing frame 16, a connecting frame 31 clamped in the Y-shaped slot 40, and a sliding column 52 rotatably installed on the connecting frame 31. The adjusting assembly further comprises a sleeve block 30 fixed on the side wall of the rotating sleeve 15, a limiting block 35 slidably installed in the sleeve block 30, a connecting spring 34 fixed between the limiting block 35 and the sleeve block 30, a plurality of V-shaped clamping grooves 38 vertically formed in the side wall of the sliding column 52 and adapted to be clamped with the limiting block 35, and an axial spring 36 fixed between the sliding column 52 and the rotating sleeve 15. The limiting block 35 is clamped with the V-shaped clamping groove 38 at a corresponding position, so that the sliding column 52 can be adjusted in position relative to the rotating sleeve 15.

[0041] Through the above arrangement, in the initial state, the two extension sleeve plates 12 are in a parallel state, and the connecting frame 31 is clamped in the Y-shaped slot 40. At this time, the height of the connecting frame 31 can be adjusted by the adjusting assembly, that is, the height position of the sliding column 52 and the leveling disc 13 can be adjusted.

[0042] Specifically, the screw rod 39 is driven to rotate by rotating the screw wheel 41, and the threaded sleeve 32 threadedly connected with the screw rod 39 is vertically moved. At this time, the pushing frame 16 fixed with the threaded sleeve 32 is vertically moved, the connecting frame 31 is vertically moved, and the sliding column 52 drives the leveling disc 13 to be vertically moved, so that the height of the leveling disc 13 is adjusted. That is, the position of the leveling disc 13 can be adjusted according to the pouring thickness of the foamed concrete, so as to adapt to the actual pouring requirements, ensure that the foamed concrete on the pouring site is fully leveled, and the pouring effect of the foamed concrete is significantly improved.

[0043] In summary, the present application is set by the spiral shaft 43 for rotation to achieve the conveying cylinder 5 inside the foamed concrete conveying, by driving assembly in the incomplete bevel gear 44 is connected with two bevel gears 46 meshing alternately, so that the spiral shaft 43 clockwise rotation alternately, ensure that the discharge pipe 8 inside the concrete can be through multiple discharge pipe 8 on the foamed concrete uniform discharge, greatly improve the quality of foamed concrete on-site pouring. The present application is set by the rotating flat disc 13 rotation to the foamed concrete on the construction site for rotating leveling, under the driving action of traction assembly, so that the rotating plate 49 can drive the extension sleeve plate 12 and flat assembly swing around the fixed column 23 center, effectively expand the flat assembly on the foamed concrete on the construction site leveling range, and under the action of the extension assembly, the extension sleeve plate 12 can reciprocating slide relative to the rotating plate 49, the foamed concrete on-site pouring effect is improved significantly.

Claims

1. A pouring device for foamed concrete, comprising a support platform (1) and a translation frame (19), wherein a mounting frame (2) is fixed on the support platform (1), and a conveying cylinder (5) is fixed on the support platform (1), characterized in that, A spiral shaft (43) is rotatably installed inside the conveying cylinder (5). A transition box (4) connected to the conveying cylinder (5) is fixed on the conveying cylinder (5). A conveying pipe (3) is connected to the transition box (4). Several linearly distributed discharge pipes (8) are evenly installed at the bottom of the conveying cylinder (5). A drive assembly for driving the spiral shaft (43) to rotate is installed on the support platform (1). A protective cover (7) is installed at the bottom of the support platform (1). Two fixed columns (23) fixed to the support platform (1) are installed inside the protective cover (7). A fixed gear (20) is fixedly sleeved on the fixed column (23). A rotating plate (49) is rotatably installed on each fixed column (23). A drive assembly for driving the spiral shaft (43) to rotate is installed inside the protective cover (7). A traction assembly drives the rotating plate (49) to rotate. An extension sleeve (12) is slidably sleeved on the rotating plate (49). An extension assembly for driving the extension sleeve (12) to slide relative to the rotating plate (49) is installed on the rotating plate (49). A pair of rotating sleeves (15) are rotatably installed at the bottom of the extension sleeve (12). The two rotating sleeves (15) are connected by a belt pulley mechanism II (29). A leveling assembly is installed on the rotating sleeves (15). The traction assembly includes a pin (45) fixed on the translation frame (19). An extension plate (24) is fixed at one end of the rotating plate (49) away from the extension sleeve (12). A strip hole (33) is opened on the extension plate (24). The pin (45) is slidably adapted to the strip hole (33). The traction assembly also includes a turntable (11) rotatably mounted on the bottom of the support platform (1). The drive assembly includes a gearbox (6) fixed on the support platform (1). Two bevel gears (46) coaxially fixed with the spiral shaft (43) are rotatably mounted in the gearbox (6). An incomplete bevel gear (44) is rotatably mounted in the gearbox (6). The incomplete bevel gear (44) alternately meshes with the two bevel gears (46). A dual-axis motor (9) is fixed on the support platform (1). One output shaft of the dual-axis motor (9) is connected to the incomplete bevel gear (44) through a pulley mechanism I (10). The other output shaft of the dual-axis motor (9) The slide column (18) is eccentrically hinged to the turntable (11) and the sliding frame (17) is fixed on the translation frame (19). The slide column (18) and the sliding frame (17) are slidably adapted to each other. A horizontal rod (48) is fixed at the bottom of the support platform (1). The translation frame (19) is slidably sleeved on the horizontal rod (48). The extension assembly includes an intermediate gear (21) and a transmission gear (22) rotatably mounted on the rotating plate (49). The fixed gear (20) and the transmission gear (22) are both meshed with the intermediate gear (21). A rack (51) parallel to the rotating plate (49) is fixed on the extension sleeve plate (12). The rack (51) is meshed with the transmission gear (22).The extension assembly also includes a fixing plate (27) fixed to the extension sleeve (12), a vertical plate (25) fixed to the rotating plate (49), a sliding rod (26) that slides through the vertical plate (25) fixed to the fixing plate (27), a spring ring (28) with its two ends fixed to the fixing plate (27) and the vertical plate (25) respectively sleeved on the sliding rod (26), and an arc-shaped guide rod (50) fixed to the bottom of the support platform (1), with the vertical plate (25) slidably sleeved on the arc-shaped guide rod (50).

2. The pouring equipment for foamed concrete according to claim 1, characterized in that, The leveling component includes a sliding column (52) that is vertically slidably mounted on the rotating sleeve (15). The side wall of the sliding column (52) is fixed with a retaining strip (37) that is slidably embedded in the inner wall of the rotating sleeve (15). The bottom of the sliding column (52) is fixed with a horizontally arranged leveling plate (13). The extension sleeve (12) is fixed with a drive motor (14) for driving the rotating sleeve (15) to rotate. The support platform (1) is equipped with an adjustment component for driving the sliding column (52) to move vertically.

3. The pouring equipment for foamed concrete according to claim 2, characterized in that, The adjustment assembly includes a screw (39) rotatably mounted on a support platform (1), a threaded sleeve (32) threaded onto the screw (39), a limit rod (42) fixed at the bottom of the support platform (1), a guide frame (47) slidably mounted on the threaded sleeve (32) and a lever (16) fixed at the bottom of the threaded sleeve (32), a Y-shaped groove (40) opened on the lever (16), a connecting frame (31) snapped into the Y-shaped groove (40), and a sliding column (52) rotatably mounted on the connecting frame (31).

4. The pouring equipment for foamed concrete according to claim 3, characterized in that, The adjustment assembly also includes a sleeve block (30) fixed to the side wall of the rotating sleeve (15). A limiting block (35) is slidably installed inside the sleeve block (30). A connecting spring (34) is fixed between the limiting block (35) and the sleeve block (30). A plurality of V-shaped slots (38) that are adapted to engage with the limiting block (35) are vertically opened on the side wall of the sliding column (52). The V-shaped slots (38) are linearly distributed at equal intervals along the axial direction of the sliding column (52). An axial spring (36) is fixed between the sliding column (52) and the rotating sleeve (15).

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